Lars,
I believe 'unpack' is the right way to go, you just need to get the template
right ('N' in your example)
See the explanation on http://www.perlmonks.org/?node_id=224666, especially the
section on 'unpack'
"unpack takes a template string and a scalar and returns a list of values."
($order_time, $monk, $itemname, $quantity, $ignore) =
unpack( "l i Z32 s2", $rec );
Duncs
-----Original Message-----
From: Lars Noodén [mailto:[email protected]]
Sent: 31 March 2016 11:50
To: Perl Beginners <[email protected]>
Subject: Processing binary data
What are the best practices for working with binary data? If I read a
span of binary data, say, into $packet like with read() below
my ( $packet_size, $packet );
read( $client_socket, $packet_size, 4 );
$packet_size = unpack( "N", $packet_size );
read( $client_socket, $packet, $packet_size );
then how should I best access arbitrary ranges of bytes within that
block of binary data held by the $packet variable?
For example, put the first byte from $packet into one variable, the
second byte into another, the third through 18th into yet another, and
so on?
Regards,
Lars
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